// JavaScript Document
$move_by = 660;
$frame_left = 0;
$frame_no = 1;
$start_middle = 0;

$(document).ready(function()
{
	
	$max_clicks = $("#image_container").children().size(); 	
	/* Kudos to Rob MacKay [http://www.twitter.com/svgrob] for suggesting that we don't have to put a static style="width: 3960px" attribute in the div tag */
	$imgCont = $move_by * $max_clicks; 
	
	$("#image_container").css({width : $imgCont});
	
	if($start_middle == 1)
		{
			// Get the middle frame, according to the $max_clicks
			$new_frame_no = ($max_clicks/2).toFixed(0)
			
			// Adjust the frame position
			$new_left = -($new_frame_no * $move_by);						
			$new_left_attr = $new_left+"px";
			
			// Do the move
			$("#image_container").animate({left: $new_left_attr}, 800 );
			
			// Save the new values
			$frame_left = $new_left;
			$frame_no = ($new_frame_no/1 + 1);
		}
	
	$(".prev").click(function()
		{
			/* Set the new position & frame number */
			$new_frame_no = (($frame_no/1)-1);
			$new_left = (($frame_left/1) + $move_by);
			/* Check if we're moving too far over */
			if($new_frame_no <= 0)
				{
					/* Move the images all the way left, minus one frame */
					$new_left = -($move_by*$max_clicks)+$move_by;
					$new_frame_no = $max_clicks;
				}
			$new_left_attr = $new_left+"px";
			$("#image_container").animate({left: $new_left_attr}, 800 );
			$frame_left = $new_left;
			$frame_no = $new_frame_no;
			
		});
	$(".next").click(function()
		{
			/* Set the new position & frame number */
			$new_frame_no = (($frame_no/1)+1);
			$new_left = (($frame_left/1) - $move_by);
			/* Check if we're moving too far over */
			if($new_frame_no > $max_clicks)
				{		
					/* Move all the way right, to the beginning*/
					$new_left = 0;
					$new_frame_no = 1;
				}				
			$new_left_attr = $new_left+"px";
			$("#image_container").animate({left: $new_left_attr}, 800 );
			$frame_left = $new_left;
			$frame_no = $new_frame_no;
		});	
});
